Move libcli/auth to the top level

1 files changed, 595 insertions, 0 deletions

diff --git a/libcli/auth/smbencrypt.c b/libcli/auth/smbencrypt.c
new file mode 100644
index 0000000000..c6118c6568
--- /dev/null
+++ b/libcli/auth/smbencrypt.c
@@ -0,0 +1,595 @@
+/* 
+   Unix SMB/CIFS implementation.
+   SMB parameters and setup
+   Copyright (C) Andrew Tridgell 1992-1998
+   Modified by Jeremy Allison 1995.
+   Copyright (C) Jeremy Allison 1995-2000.
+   Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/time.h"
+#include "auth/ntlmssp/ntlmssp.h"
+#include "auth/ntlmssp/msrpc_parse.h"
+#include "../lib/crypto/crypto.h"
+#include "libcli/auth/libcli_auth.h"
+
+/*
+   This implements the X/Open SMB password encryption
+   It takes a password ('unix' string), a 8 byte "crypt key" 
+   and puts 24 bytes of encrypted password into p24 
+
+   Returns false if password must have been truncated to create LM hash
+*/
+bool SMBencrypt(const char *passwd, const uint8_t *c8, uint8_t p24[24])
+{
+	bool ret;
+	uint8_t p21[21];
+
+	memset(p21,'\0',21);
+	ret = E_deshash(passwd, p21); 
+
+	SMBOWFencrypt(p21, c8, p24);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
+	dump_data(100, p21, 16);
+	dump_data(100, c8, 8);
+	dump_data(100, p24, 24);
+#endif
+
+	return ret;
+}
+
+/**
+ * Creates the MD4 Hash of the users password in NT UNICODE.
+ * @param passwd password in 'unix' charset.
+ * @param p16 return password hashed with md4, caller allocated 16 byte buffer
+ */
+ 
+bool E_md4hash(const char *passwd, uint8_t p16[16])
+{
+	size_t len;
+	smb_ucs2_t *wpwd;
+	bool ret;
+
+	ret = push_ucs2_talloc(NULL, &wpwd, passwd, &len);
+	if (!ret || len < 2) {
+		/* We don't want to return fixed data, as most callers
+		 * don't check */
+		mdfour(p16, (const uint8_t *)passwd, strlen(passwd));
+		return false;
+	}
+	
+	len -= 2;
+	mdfour(p16, (const uint8_t *)wpwd, len);
+
+	talloc_free(wpwd);
+	return true;
+}
+
+/**
+ * Creates the DES forward-only Hash of the users password in DOS ASCII charset
+ * @param passwd password in 'unix' charset.
+ * @param p16 return password hashed with DES, caller allocated 16 byte buffer
+ * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
+ * @note p16 is filled in regardless
+ */
+ 
+bool E_deshash(const char *passwd, uint8_t p16[16])
+{
+	bool ret = true;
+	char dospwd[256];
+	ZERO_STRUCT(dospwd);
+
+	/* Password must be converted to DOS charset - null terminated, uppercase. */
+	push_string(dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE);
+
+	/* Only the first 14 chars are considered, password need not be null terminated. */
+	E_P16((const uint8_t *)dospwd, p16);
+
+	if (strlen(dospwd) > 14) {
+		ret = false;
+	}
+
+	ZERO_STRUCT(dospwd);	
+
+	return ret;
+}
+
+/* Does both the NTLMv2 owfs of a user's password */
+bool ntv2_owf_gen(const uint8_t owf[16],
+		  const char *user_in, const char *domain_in,
+		  bool upper_case_domain, /* Transform the domain into UPPER case */
+		  uint8_t kr_buf[16])
+{
+	smb_ucs2_t *user;
+	smb_ucs2_t *domain;	
+	size_t user_byte_len;
+	size_t domain_byte_len;
+	bool ret;
+
+	HMACMD5Context ctx;
+	TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in); 
+
+	if (!mem_ctx) {
+		return false;
+	}
+
+	if (!user_in) {
+		user_in = "";
+	}
+
+	if (!domain_in) {
+		domain_in = "";
+	}
+
+	user_in = strupper_talloc(mem_ctx, user_in);
+	if (user_in == NULL) {
+		talloc_free(mem_ctx);
+		return false;
+	}
+
+	if (upper_case_domain) {
+		domain_in = strupper_talloc(mem_ctx, domain_in);
+		if (domain_in == NULL) {
+			talloc_free(mem_ctx);
+			return false;
+		}
+	}
+
+	ret = push_ucs2_talloc(mem_ctx, &user, user_in, &user_byte_len );
+	if (!ret) {
+		DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
+		talloc_free(mem_ctx);
+		return false;
+	}
+
+	ret = push_ucs2_talloc(mem_ctx, &domain, domain_in, &domain_byte_len);
+	if (!ret) {
+		DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
+		talloc_free(mem_ctx);
+		return false;
+	}
+
+	SMB_ASSERT(user_byte_len >= 2);
+	SMB_ASSERT(domain_byte_len >= 2);
+
+	/* We don't want null termination */
+	user_byte_len = user_byte_len - 2;
+	domain_byte_len = domain_byte_len - 2;
+	
+	hmac_md5_init_limK_to_64(owf, 16, &ctx);
+	hmac_md5_update((const void *)user, user_byte_len, &ctx);
+	hmac_md5_update((const void *)domain, domain_byte_len, &ctx);
+	hmac_md5_final(kr_buf, &ctx);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
+	dump_data(100, (const void *)user, user_byte_len);
+	dump_data(100, (const void *)domain, domain_byte_len);
+	dump_data(100, owf, 16);
+	dump_data(100, kr_buf, 16);
+#endif
+
+	talloc_free(mem_ctx);
+	return true;
+}
+
+/* Does the des encryption from the NT or LM MD4 hash. */
+void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24])
+{
+	uint8_t p21[21];
+
+	ZERO_STRUCT(p21);
+ 
+	memcpy(p21, passwd, 16);    
+	E_P24(p21, c8, p24);
+}
+
+/* Does the NT MD4 hash then des encryption. */
+ 
+void SMBNTencrypt(const char *passwd, uint8_t *c8, uint8_t *p24)
+{
+	uint8_t p21[21];
+ 
+	memset(p21,'\0',21);
+ 
+	E_md4hash(passwd, p21);    
+	SMBOWFencrypt(p21, c8, p24);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
+	dump_data(100, p21, 16);
+	dump_data(100, c8, 8);
+	dump_data(100, p24, 24);
+#endif
+}
+
+/* Does the md5 encryption from the Key Response for NTLMv2. */
+void SMBOWFencrypt_ntv2(const uint8_t kr[16],
+			const DATA_BLOB *srv_chal,
+			const DATA_BLOB *smbcli_chal,
+			uint8_t resp_buf[16])
+{
+	HMACMD5Context ctx;
+
+	hmac_md5_init_limK_to_64(kr, 16, &ctx);
+	hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
+	hmac_md5_update(smbcli_chal->data, smbcli_chal->length, &ctx);
+	hmac_md5_final(resp_buf, &ctx);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
+	dump_data(100, srv_chal->data, srv_chal->length);
+	dump_data(100, smbcli_chal->data, smbcli_chal->length);
+	dump_data(100, resp_buf, 16);
+#endif
+}
+
+void SMBsesskeygen_ntv2(const uint8_t kr[16],
+			const uint8_t * nt_resp, uint8_t sess_key[16])
+{
+	/* a very nice, 128 bit, variable session key */
+	
+	HMACMD5Context ctx;
+
+	hmac_md5_init_limK_to_64(kr, 16, &ctx);
+	hmac_md5_update(nt_resp, 16, &ctx);
+	hmac_md5_final((uint8_t *)sess_key, &ctx);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
+	dump_data(100, sess_key, 16);
+#endif
+}
+
+void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16])
+{
+	/* yes, this session key does not change - yes, this 
+	   is a problem - but it is 128 bits */
+	
+	mdfour((uint8_t *)sess_key, kr, 16);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
+	dump_data(100, sess_key, 16);
+#endif
+}
+
+void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash[16],
+			       const uint8_t lm_resp[24], /* only uses 8 */ 
+			       uint8_t sess_key[16])
+{
+	/* Calculate the LM session key (effective length 40 bits,
+	   but changes with each session) */
+	uint8_t p24[24];
+	uint8_t partial_lm_hash[14];
+ 
+	memcpy(partial_lm_hash, lm_hash, 8);    
+	memset(partial_lm_hash + 8, 0xbd, 6);
+
+	des_crypt56(p24,   lm_resp, partial_lm_hash,     1);
+	des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1);
+
+	memcpy(sess_key, p24, 16);
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
+	dump_data(100, sess_key, 16);
+#endif
+}
+
+DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx, 
+				     const char *hostname, 
+				     const char *domain)
+{
+	DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0);
+	
+	msrpc_gen(mem_ctx, &names_blob, 
+		  "aaa", 
+		  NTLMSSP_NAME_TYPE_DOMAIN, domain,
+		  NTLMSSP_NAME_TYPE_SERVER, hostname,
+		  0, "");
+	return names_blob;
+}
+
+static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob) 
+{
+	uint8_t client_chal[8];
+	DATA_BLOB response = data_blob(NULL, 0);
+	uint8_t long_date[8];
+	NTTIME nttime;
+
+	unix_to_nt_time(&nttime, time(NULL));
+
+	generate_random_buffer(client_chal, sizeof(client_chal));
+
+	push_nttime(long_date, 0, nttime);
+
+	/* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
+
+	msrpc_gen(mem_ctx, &response, "ddbbdb", 
+		  0x00000101,     /* Header  */
+		  0,              /* 'Reserved'  */
+		  long_date, 8,	  /* Timestamp */
+		  client_chal, 8, /* client challenge */
+		  0,		  /* Unknown */
+		  names_blob->data, names_blob->length);	/* End of name list */
+
+	return response;
+}
+
+static DATA_BLOB NTLMv2_generate_response(TALLOC_CTX *out_mem_ctx, 
+					  const uint8_t ntlm_v2_hash[16],
+					  const DATA_BLOB *server_chal,
+					  const DATA_BLOB *names_blob)
+{
+	uint8_t ntlmv2_response[16];
+	DATA_BLOB ntlmv2_client_data;
+	DATA_BLOB final_response;
+	
+	TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0, 
+					   "NTLMv2_generate_response internal context");
+
+	if (!mem_ctx) {
+		return data_blob(NULL, 0);
+	}
+	
+	/* NTLMv2 */
+	/* generate some data to pass into the response function - including
+	   the hostname and domain name of the server */
+	ntlmv2_client_data = NTLMv2_generate_client_data(mem_ctx, names_blob);
+
+	/* Given that data, and the challenge from the server, generate a response */
+	SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
+	
+	final_response = data_blob_talloc(out_mem_ctx, NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
+
+	memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
+
+	memcpy(final_response.data+sizeof(ntlmv2_response), 
+	       ntlmv2_client_data.data, ntlmv2_client_data.length);
+
+	talloc_free(mem_ctx);
+
+	return final_response;
+}
+
+static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx, 
+					const uint8_t ntlm_v2_hash[16],
+					const DATA_BLOB *server_chal)
+{
+	uint8_t lmv2_response[16];
+	DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8);
+	DATA_BLOB final_response = data_blob_talloc(mem_ctx, NULL,24);
+	
+	/* LMv2 */
+	/* client-supplied random data */
+	generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length);	
+
+	/* Given that data, and the challenge from the server, generate a response */
+	SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
+	memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
+
+	/* after the first 16 bytes is the random data we generated above, 
+	   so the server can verify us with it */
+	memcpy(final_response.data+sizeof(lmv2_response), 
+	       lmv2_client_data.data, lmv2_client_data.length);
+
+	data_blob_free(&lmv2_client_data);
+
+	return final_response;
+}
+
+bool SMBNTLMv2encrypt_hash(TALLOC_CTX *mem_ctx, 
+			   const char *user, const char *domain, const uint8_t nt_hash[16],
+			   const DATA_BLOB *server_chal, 
+			   const DATA_BLOB *names_blob,
+			   DATA_BLOB *lm_response, DATA_BLOB *nt_response, 
+			   DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key) 
+{
+	uint8_t ntlm_v2_hash[16];
+
+	/* We don't use the NT# directly.  Instead we use it mashed up with
+	   the username and domain.
+	   This prevents username swapping during the auth exchange
+	*/
+	if (!ntv2_owf_gen(nt_hash, user, domain, true, ntlm_v2_hash)) {
+		return false;
+	}
+	
+	if (nt_response) {
+		*nt_response = NTLMv2_generate_response(mem_ctx, 
+							ntlm_v2_hash, server_chal,
+							names_blob); 
+		if (user_session_key) {
+			*user_session_key = data_blob_talloc(mem_ctx, NULL, 16);
+			
+			/* The NTLMv2 calculations also provide a session key, for signing etc later */
+			/* use only the first 16 bytes of nt_response for session key */
+			SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data);
+		}
+	}
+	
+	/* LMv2 */
+	
+	if (lm_response) {
+		*lm_response = LMv2_generate_response(mem_ctx, 
+						      ntlm_v2_hash, server_chal);
+		if (lm_session_key) {
+			*lm_session_key = data_blob_talloc(mem_ctx, NULL, 16);
+			
+			/* The NTLMv2 calculations also provide a session key, for signing etc later */
+			/* use only the first 16 bytes of lm_response for session key */
+			SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
+		}
+	}
+	
+	return true;
+}
+
+bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx, 
+		      const char *user, const char *domain, 
+		      const char *password, 
+		      const DATA_BLOB *server_chal, 
+		      const DATA_BLOB *names_blob,
+		      DATA_BLOB *lm_response, DATA_BLOB *nt_response, 
+		      DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key) 
+{
+	uint8_t nt_hash[16];
+	E_md4hash(password, nt_hash);
+
+	return SMBNTLMv2encrypt_hash(mem_ctx, 
+				     user, domain, nt_hash, server_chal, names_blob,
+				     lm_response, nt_response, lm_session_key, user_session_key);
+}
+
+/***********************************************************
+ encode a password buffer with a unicode password.  The buffer
+ is filled with random data to make it harder to attack.
+************************************************************/
+bool encode_pw_buffer(uint8_t buffer[516], const char *password, int string_flags)
+{
+	uint8_t new_pw[512];
+	size_t new_pw_len;
+
+	/* the incoming buffer can be any alignment. */
+	string_flags |= STR_NOALIGN;
+
+	new_pw_len = push_string(new_pw,
+				 password, 
+				 sizeof(new_pw), string_flags);
+	
+	memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len);
+
+	generate_random_buffer(buffer, 512 - new_pw_len);
+
+	/* 
+	 * The length of the new password is in the last 4 bytes of
+	 * the data buffer.
+	 */
+	SIVAL(buffer, 512, new_pw_len);
+	ZERO_STRUCT(new_pw);
+	return true;
+}
+
+
+/***********************************************************
+ decode a password buffer
+ *new_pw_len is the length in bytes of the possibly mulitbyte
+ returned password including termination.
+************************************************************/
+bool decode_pw_buffer(uint8_t in_buffer[516], char *new_pwrd,
+		      int new_pwrd_size, int string_flags)
+{
+	int byte_len=0;
+	ssize_t converted_pw_len;
+
+	/* the incoming buffer can be any alignment. */
+	string_flags |= STR_NOALIGN;
+
+	/*
+	  Warning !!! : This function is called from some rpc call.
+	  The password IN the buffer may be a UNICODE string.
+	  The password IN new_pwrd is an ASCII string
+	  If you reuse that code somewhere else check first.
+	*/
+
+	/* The length of the new password is in the last 4 bytes of the data buffer. */
+
+	byte_len = IVAL(in_buffer, 512);
+
+#ifdef DEBUG_PASSWORD
+	dump_data(100, in_buffer, 516);
+#endif
+
+	/* Password cannot be longer than the size of the password buffer */
+	if ( (byte_len < 0) || (byte_len > 512)) {
+		return false;
+	}
+
+	/* decode into the return buffer.  Buffer length supplied */
+ 	converted_pw_len = pull_string(new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, 
+				  byte_len, string_flags);
+
+	if (converted_pw_len == -1) {
+		return false;
+	}
+
+#ifdef DEBUG_PASSWORD
+	DEBUG(100,("decode_pw_buffer: new_pwrd: "));
+	dump_data(100, (const uint8_t *)new_pwrd, converted_pw_len);
+	DEBUG(100,("multibyte len:%d\n", (int)converted_pw_len));
+	DEBUG(100,("original char len:%d\n", byte_len/2));
+#endif
+	
+	return true;
+}
+
+/***********************************************************
+ encode a password buffer with an already unicode password.  The
+ rest of the buffer is filled with random data to make it harder to attack.
+************************************************************/
+bool set_pw_in_buffer(uint8_t buffer[516], DATA_BLOB *password)
+{
+	if (password->length > 512) {
+		return false;
+	}
+
+	memcpy(&buffer[512 - password->length], password->data, password->length);
+
+	generate_random_buffer(buffer, 512 - password->length);
+
+	/* 
+	 * The length of the new password is in the last 4 bytes of
+	 * the data buffer.
+	 */
+	SIVAL(buffer, 512, password->length);
+	return true;
+}
+
+/***********************************************************
+ decode a password buffer
+ *new_pw_size is the length in bytes of the extracted unicode password
+************************************************************/
+bool extract_pw_from_buffer(TALLOC_CTX *mem_ctx, 
+			    uint8_t in_buffer[516], DATA_BLOB *new_pass)
+{
+	int byte_len=0;
+
+	/* The length of the new password is in the last 4 bytes of the data buffer. */
+
+	byte_len = IVAL(in_buffer, 512);
+
+#ifdef DEBUG_PASSWORD
+	dump_data(100, in_buffer, 516);
+#endif
+
+	/* Password cannot be longer than the size of the password buffer */
+	if ( (byte_len < 0) || (byte_len > 512)) {
+		return false;
+	}
+
+	*new_pass = data_blob_talloc(mem_ctx, &in_buffer[512 - byte_len], byte_len);
+
+	if (!new_pass->data) {
+		return false;
+	}
+
+	return true;
+}